GDAL C# 开发环境配置
目录
一、GDAL C# 部分资源及参考
二、GDAL C# DLL 下载
1.编译后的DLL下载地址:http://www.gisinternals.com/sdk/,在“GDAL and MapServer lasted release version”中下载最新版本。
2.点击后进入下载页面:
http://www.gisinternals.com/sdk/PackageList.aspx?file=release-1400-gdal-1-10-1-mapserver-6-4-1.zip
3.编译后的DLL除了gdal110.dll及其依赖项位于bin目录下,其余的均在压缩包中的【bin\gdal\csharp\…】目录下:
4.开发时把以“_csharp.dll”结尾的dll库添加到项目引用中,其余的拷贝到debug目录下。
三、常见异常解决
原因分析:1.gdal初始化时,因其依赖dll项不全导致注册失败抛出异常,可采用Dependency Walker工具查看相关依赖项。简单的把九个DLL和找到的所有依赖项拷贝到debug目录下,通常也是不能解决问题的。
2.如果同一个应用程序的主程序与其所引用的类库使用不同版本的gdal csharp dll 文件,会出现同样的异常。
3.综合分析此异常是因其依赖的dll 和 配置信息引起的,且dll 与配置相关的文件必须对应。
解决方法:采用SharpMap的GDAL初始化方法解决,需要两个数据:
1. GdalConfiguration.cs
2. gdal_data_config.rar
注:以上两文件下载地址:gdal_csharp开发环境配置文件
第一步:将GdalConfiguration.cs添加到项目中,然后解压gdal_data_config.rar到debug目录下,文件夹名称为gdal。
第二步:在使用Gdal.AllRegister()初始化前,调用以下两句代码进行相关初始化数据的配置即可。
SharpMap.GdalConfiguration.ConfigureGdal();
SharpMap.GdalConfiguration.ConfigureOgr();
3.GdalConfiguration类的内容如下:
/******************************************************************************
*
* Name: GdalConfiguration.cs.pp
* Project: GDAL CSharp Interface
* Purpose: A static configuration utility class to enable GDAL/OGR.
* Author: Felix Obermaier
*
*****************************************************************************/
using System;
using System.IO;
using System.Reflection;
using Gdal = OSGeo.GDAL.Gdal;
using Ogr = OSGeo.OGR.Ogr;
namespace SharpMap
{
public static partial class GdalConfiguration
{
private static bool _configuredOgr;
private static bool _configuredGdal;
/// <summary>
/// Function to determine which platform we're on
/// </summary>
private static string GetPlatform()
{
return IntPtr.Size == 4 ? "x86" : "x64";
}
/// <summary>
/// Construction of Gdal/Ogr
/// </summary>
static GdalConfiguration()
{
var executingAssemblyFile = new Uri(Assembly.GetExecutingAssembly().GetName().CodeBase).LocalPath;
var executingDirectory = Path.GetDirectoryName(executingAssemblyFile);
if (string.IsNullOrEmpty(executingDirectory))
throw new InvalidOperationException("cannot get executing directory");
var gdalPath = Path.Combine(executingDirectory, "gdal");
var nativePath = Path.Combine(gdalPath, GetPlatform());
// Prepend native path to environment path, to ensure the
// right libs are being used.
var path = Environment.GetEnvironmentVariable("PATH");
path = nativePath + ";" + Path.Combine(nativePath, "plugins") + ";" + path;
Environment.SetEnvironmentVariable("PATH", path);
// Set the additional GDAL environment variables.
var gdalData = Path.Combine(gdalPath, "data");
Environment.SetEnvironmentVariable("GDAL_DATA", gdalData);
Gdal.SetConfigOption("GDAL_DATA", gdalData);
var driverPath = Path.Combine(nativePath, "plugins");
Environment.SetEnvironmentVariable("GDAL_DRIVER_PATH", driverPath);
Gdal.SetConfigOption("GDAL_DRIVER_PATH", driverPath);
Environment.SetEnvironmentVariable("GEOTIFF_CSV", gdalData);
Gdal.SetConfigOption("GEOTIFF_CSV", gdalData);
var projSharePath = Path.Combine(gdalPath, "share");
Environment.SetEnvironmentVariable("PROJ_LIB", projSharePath);
Gdal.SetConfigOption("PROJ_LIB", projSharePath);
}
/// <summary>
/// Method to ensure the static constructor is being called.
/// </summary>
/// <remarks>Be sure to call this function before using Gdal/Ogr/Osr</remarks>
public static void ConfigureOgr()
{
if (_configuredOgr) return;
// Register drivers
Ogr.RegisterAll();
_configuredOgr = true;
}
/// <summary>
/// Method to ensure the static constructor is being called.
/// </summary>
/// <remarks>Be sure to call this function before using Gdal/Ogr/Osr</remarks>
public static void ConfigureGdal()
{
if (_configuredGdal) return;
// Register drivers
Gdal.AllRegister();
_configuredGdal = true;
}
}
}
四、GDAL读写Shape数据时的中文乱码问题
// 设置Shp字段、属性等的编码为空
Gdal.SetConfigOption(“SHAPE_ENCODING”, “”);
// 解决Shp文件中文路径乱码,无法读取的问题(有时去掉却可以识别中文,待解决)
Gdal.SetConfigOption(“GDAL_FILENAME_IS_UTF8”, “NO”);//不能完全解决中文路径的问题,路径包含奇数个中文时通常都无法正确识别,偶数则正常
注:如果使用上面第三部分描述的方法,仍存在类型初始值异常问题,请把程序debug目录下以非_csharp结尾的dll删掉即可(代码已自动匹配gdal文件夹下的相关dll)。
转载自:https://blog.csdn.net/mygisforum/article/details/22478491